Abstract
A nanoporous silica functionalized, energy absorbing material is developed based on crosslinked poly(acrylic acid-co-acrylamide) potassium salt (PAAK) gel. When subjected to a sufficiently high pressure, water molecules can be released from the gel matrix and forced into the nanoporous particles. Since the large nanopore surface can significantly amplify the capillary effect, the energy absorption efficiency is very high, making this material attractive for protection and damping applications. The sorption isotherm curves are quite independent of the PAAK concentration, suggesting that the capillary effect of nanopores is the dominant factor.
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